Question: Who was the head of Nuremberg's government in 1891?
Paraphrase: In 1891, who was the government head of Nuremberg?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q2090 p:P6 ?s . ?s ps:P6 ?obj . ?s pq:P582 ?x filter(contains(YEAR(?x),'1891')) }